Possible Clues:

• Peanuts character usually seen with a blue security blanket
• 'Peanuts' boy with a security blanket
• Boy in 'A Charlie Brown Christmas'
• "Peanuts" character
• Rising star I left, Lucy's brother
• 'Peanuts' thumb-sucker
• 'House intellectual' in 'Peanuts,' per Schulz
• Two-time Nobelist Pauling
• Middle van Pelt child in 'Peanuts'
• Boy who said 'Sure, Charlie Brown, I can tell you what Christmas is all about'